June i, 1921 
Effect of Ration on the Development of Pigs 
285 
SLAUGHTER TESTS 
One or two representative pigs were slaughtered and analyzed at the 
beginning of the trial, it being assumed that the rest of the pigs used in 
the trial had the same average composition as these pigs which were 
designated as control pigs. At the close of the trial one representative 
pig from each of several lots was slaughtered. In this and the following 
sections only the data from pigs slaughtered are used. The following are 
the most important data which were obtained at the time of slaughter: 
Live weight. 
Weight of blood as obtained. 
Weight of dressed carcass. 
Weight of the several internal organs. 
Weight of stomach, intestines, and bladder before and after 
removing contents. 
Weight of fatty tissues, lean tissue, skin, and bones. 
Chemical composition of the various portions into which the ani¬ 
mals were divided. 
After separation, these parts or portions were ground to a pulp by 
passing several times through a power sausage mill. The bones were first 
passed through a bone cutter. In the first three experiments six samples 
from each pig were prepared and analyzed—namely, blood, internal 
organs, lean tissue, fat tissue, skin, and bones. In experiments V and 
VI these were combined so as to make but two samples, soft tissue and 
bones. Since the weight of these several portions and the percentages of 
moisture, ash, protein, and ether extract or fat were known, 1 it was 
possible to calculate the pounds of these constituents present. The per¬ 
centage composition was then calculated by dividing the total pounds of 
each of the several constituents by the live or empty weight, as the case 
might be. This latter refers to the weight of the animal less the weight 
of the contents of the stomach, intestines, and bladder. In this paper 
the percentages on the basis of empty weight are used. 
PERCENTAGE COMPOSITION OF THE CONTROL PIGS 
The percentages of moisture, ash, protein, and ether extract or fat, as 
well as the age and empty weight of the control pigs slaughtered in these 
five experiments, are given in Table II. In experiments II and III there 
were two control pigs slaughtered and analyzed, and the figures given are 
the averages of these. Unfortunately, the ages of the pigs in the different 
experiments are not the same. The fact that the pigs were started at an 
earlier age in some experiments than in others no doubt had an influence 
on the results. 
1 As this ether extract was nearly pure fat, this term will be used. 
